Extension post for chain post binders



Oct. 18, 1932. Q UNGER 1,883,253

EXTENSION POST FOR CHAIN POST BINDERS Filed Sept. 25. 1950 PafiZ 0 547 b; 7: a k

Patented Oct. 18, 1932 UNITED STATES PATENT OFFICE PAUL O. UNGER, OF CHICAGO, ILLINOIS, ASSIGNOR 'IO WILSON-JONES COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF MASSACHUSETTS EXTENSION POST FOR CHAIN POST BINDERS Application filed September 25, 1930.

This invention relates to an extension post for chain post binders.

It has been found in practice that when the extension post only goes through one wall of the clamping member as shown in said application, there is too much play and looseness. According to this invention, the extension post is extended through both the bottom and top wall of the clamping member to avoid the looseness and play that heretofore existed.

The invention comprises the novel structure and combination of parts hereinafter described and more particularly pointed out and defined in the appended claims.

In the accompanying drawing which illustrates a preferred form of this invention and in which similar reference numerals refer to similar features in the different views:

Fig. l is a longitudinal and vertical sectional view through a clamping member of a binder involving this invention.

Fig. 2 is a fragmentary top plan view of the same with part of the covering broken away.

Fig. 3 is an elevational view of head of the extension post. I

In the drawing, there is shown a lower hollow clamping member 1, having a right and left hand threaded screw 2 journalled therein as usual in chain post binders. A pair of nuts 3 are threaded upon the screw and chain posts 4 are connected to these nuts. Each chain 4 is provided with an extension post 5 having a threaded socket in which an extension post section (not shown) may be screwed, or in which a head 6 may be screwed if such an extension is not necessary.

According to this invention, each head is provided with a threaded portion 7 which fits in the socket of the post 5 or in the socket of any added extension post section. Above the threaded portion 7 of the head, there is a circular flange 8 which is designed to abut the lower wall of the upper clamping member 1a and press upon the loose sheets. Above said flange 8, there is a boss 9 which is designed to extend into an aperture in the lower wall of the upper clamping member, and above this boss there is a restricted neck 10 Serial No. 484,339.

The slide 11 is adapted to be actuated by a suitable key which rotates a screw 14 which abuts one end of the slide. A spring 15 bears against the other end of the slide to relelase the same when the screw 14 is actuate Itwill be evident that since the head 6 of the extension post, not only passes thru the lower wall of the clamping member but also into an aperture or socket in the upper wall thereof it is maintained at two spaced points against wobbling or lateral movement.

I am aware that many changes may be made, and numerous details of construction may be varied through a wide range without departing from the principles of this invention, and I therefore do not purpose limiting the patent granted hereon, otherwise than necessitated by the prior art.

I claim as my invention:

1. In a chain post binder. a lower clamping member, take-up mechanism in said clamping member, flexible posts connected to said take-up mechanism, an upper hollow member having upper and lower walls with apertures, heads upon said flexible posts hav ing clamping flanges beneath said lower wall and having upper bearing portions extend ing through the apertures of both walls to prevent tilting movement thereof and means for latching said posts to said hollow memher.

2. In a chain post binder, a lower clamping member, take-up mechanism in said clamping member, flexible posts connected to said take-up mechanism, an upper member havin vertically space-d bearings, heads upon said posts extending into said spaced bearings for preventing tilting thereof and means for latching said heads in said upper member 3. A head for a chain post having a lower threaded portion, a flange above said threaded portion and a pair of vertically spaced bearing portions above said flange and a groove between said bearing portions.

In testimony whereof I have hereunto subscribed my name at Chicago, Cook a County.

PAULO. UNGER. 

